I never really saw what the code was after getting everything done in the game
Yeah, the way the game presents the message makes it easy to miss. So I'll add a message log in the next update so you can check it in case you missed anything.
However, if you fully completed the game and it didn't show you the code, that's clearly a bug, and I'd like to see your save file and Player.log if possible. What platform are you playing on?